What will be the next letters in the following series: ACF, GIL, MOR, ???
Detailed Solution:
Correct Answer: SUV
Each letter in the series advances by +6 positions in the alphabet: A(1)+6=G(7), C(3)+6=I(9), F(6)+6=L(12); then G+6=M, I+6=O, L+6=R; thus M+6=S(19), O+6=U(21), R+6=X(24).